Fresh water resource library on rock and installing method

The invention discloses a fresh water resource library on a rock and an installing method, and belongs to the field of ocean building facilities. The fresh water resource library on the rock and the installing method are designed for building and storing fresh water on the rock in the ocean. The fresh water resource library on the rock is composed of a water inlet pipe, a fresh water making facility, a fresh water storage library, a water taking pipe, a working table, a living facility, a protection greenhouse, a heightening facility, a vertical ladder and the rock; the fresh water making facility is installed at the upper portion of the working table in the protection greenhouse, seawater is made into fresh water through the fresh water making facility to be fed into the fresh water storage library, a hole is formed in the lower portion of the fresh water storage library, the hole and the water taking pipe are solidified through sealing, the periphery of the upper portion is in sealing connection with the wo